/*
 * TMap Designer - A Thematic Map design software
 * Copyright (C) 2006 World Health Organization
 * http://www.who.int
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package who.tmap.dao.impl;

import who.tmap.bo.BizObjects;
import who.tmap.common.TMapException;
import who.tmap.common.TMapFactory;
import who.tmap.dao.TMapDAOException;
import who.tmap.dao.DAO;

/**
 * @author stl
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class DAOFactory implements TMapFactory, BizObjects {

    private static DAOFactory instance =null;
    
    /**
     * Private constructor because it is a singleton
     *
     */
    private DAOFactory() {
    }
    
    /**
     * Lazy instanciation of the factory instance
     * @return
     */
    public static synchronized DAOFactory getInstance() {
        if ( instance == null ) {
            instance =new DAOFactory();
        }
        
        return instance;
    }
    
    /**
     * Instanciates core objects
     * @param coreObjectType
     * @return
     * @throws TMapDAOException
     * @throws TMapException
     */
    public DAO get( int bizObjectType ) throws TMapDAOException {       
        DAO bizObjectDao =null;
        
        switch( bizObjectType ) {
        	case ATTRS:
        	    bizObjectDao =new DataDAOImpl();
        		break;
        		
        	case BASE_MAP:
        	    bizObjectDao =new BaseMapDAOImpl();
        	    break;
        	    
        	case THEMATIC_MAP:
        		bizObjectDao =new ThematicMapDAOImpl();
        		break;
        		
        	case ANNOTATIONS:
        		bizObjectDao =new AnnotationsDAOImpl();
        		break;
        		
        	case MULTI_LAYER_THEMATIC_MAP:
        		bizObjectDao =new MultiLayerThematicMapDAOImpl();
        		break;
        		
        	default:
        	    throw new TMapDAOException( "Invalid DAO type [" + bizObjectType + "]" );
        }
        
        return bizObjectDao;
    }
}
